重新格式化而不是剥离怎么样？

//Get post author ID
$post_author_id = get_post_field( \'post_author\', $post->ID );

//Get the registration date
$registered_date = get_the_author_meta( \'user_registered\', $post_author_id );

//Convert to desired format
$output = date( \'F j, Y\', strtotime($registered_date));

//Echo
echo $output;